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- // SPDX-License-Identifier: GPL-2.0
- /*
- * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
- *
- * Begun April 1, 1996, Mike Shaver.
- * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
- */
- #include <linux/mm.h>
- #include <linux/module.h>
- #include <linux/sysctl.h>
- #include <linux/igmp.h>
- #include <linux/inetdevice.h>
- #include <linux/seqlock.h>
- #include <linux/init.h>
- #include <linux/slab.h>
- #include <linux/nsproxy.h>
- #include <linux/swap.h>
- #include <net/snmp.h>
- #include <net/icmp.h>
- #include <net/ip.h>
- #include <net/route.h>
- #include <net/tcp.h>
- #include <net/udp.h>
- #include <net/cipso_ipv4.h>
- #include <net/inet_frag.h>
- #include <net/ping.h>
- #include <net/protocol.h>
- #include <net/netevent.h>
- static int two = 2;
- static int four = 4;
- static int thousand = 1000;
- static int gso_max_segs = GSO_MAX_SEGS;
- static int tcp_retr1_max = 255;
- static int ip_local_port_range_min[] = { 1, 1 };
- static int ip_local_port_range_max[] = { 65535, 65535 };
- static int tcp_adv_win_scale_min = -31;
- static int tcp_adv_win_scale_max = 31;
- static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
- static int tcp_min_snd_mss_max = 65535;
- static int ip_privileged_port_min;
- static int ip_privileged_port_max = 65535;
- static int ip_ttl_min = 1;
- static int ip_ttl_max = 255;
- static int tcp_syn_retries_min = 1;
- static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
- static int ip_ping_group_range_min[] = { 0, 0 };
- static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
- static int comp_sack_nr_max = 255;
- static u32 u32_max_div_HZ = UINT_MAX / HZ;
- static int one_day_secs = 24 * 3600;
- /* obsolete */
- static int sysctl_tcp_low_latency __read_mostly;
- /* Update system visible IP port range */
- static void set_local_port_range(struct net *net, int range[2])
- {
- bool same_parity = !((range[0] ^ range[1]) & 1);
- write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
- if (same_parity && !net->ipv4.ip_local_ports.warned) {
- net->ipv4.ip_local_ports.warned = true;
- pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
- }
- net->ipv4.ip_local_ports.range[0] = range[0];
- net->ipv4.ip_local_ports.range[1] = range[1];
- write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
- }
- /* Validate changes from /proc interface. */
- static int ipv4_local_port_range(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
- {
- struct net *net =
- container_of(table->data, struct net, ipv4.ip_local_ports.range);
- int ret;
- int range[2];
- struct ctl_table tmp = {
- .data = &range,
- .maxlen = sizeof(range),
- .mode = table->mode,
- .extra1 = &ip_local_port_range_min,
- .extra2 = &ip_local_port_range_max,
- };
- inet_get_local_port_range(net, &range[0], &range[1]);
- ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
- if (write && ret == 0) {
- /* Ensure that the upper limit is not smaller than the lower,
- * and that the lower does not encroach upon the privileged
- * port limit.
- */
- if ((range[1] < range[0]) ||
- (range[0] < net->ipv4.sysctl_ip_prot_sock))
- ret = -EINVAL;
- else
- set_local_port_range(net, range);
- }
- return ret;
- }
- /* Validate changes from /proc interface. */
- static int ipv4_privileged_ports(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
- {
- struct net *net = container_of(table->data, struct net,
- ipv4.sysctl_ip_prot_sock);
- int ret;
- int pports;
- int range[2];
- struct ctl_table tmp = {
- .data = &pports,
- .maxlen = sizeof(pports),
- .mode = table->mode,
- .extra1 = &ip_privileged_port_min,
- .extra2 = &ip_privileged_port_max,
- };
- pports = net->ipv4.sysctl_ip_prot_sock;
- ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
- if (write && ret == 0) {
- inet_get_local_port_range(net, &range[0], &range[1]);
- /* Ensure that the local port range doesn't overlap with the
- * privileged port range.
- */
- if (range[0] < pports)
- ret = -EINVAL;
- else
- net->ipv4.sysctl_ip_prot_sock = pports;
- }
- return ret;
- }
- static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
- {
- kgid_t *data = table->data;
- struct net *net =
- container_of(table->data, struct net, ipv4.ping_group_range.range);
- unsigned int seq;
- do {
- seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
- *low = data[0];
- *high = data[1];
- } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
- }
- /* Update system visible IP port range */
- static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
- {
- kgid_t *data = table->data;
- struct net *net =
- container_of(table->data, struct net, ipv4.ping_group_range.range);
- write_seqlock(&net->ipv4.ping_group_range.lock);
- data[0] = low;
- data[1] = high;
- write_sequnlock(&net->ipv4.ping_group_range.lock);
- }
- /* Validate changes from /proc interface. */
- static int ipv4_ping_group_range(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
- {
- struct user_namespace *user_ns = current_user_ns();
- int ret;
- gid_t urange[2];
- kgid_t low, high;
- struct ctl_table tmp = {
- .data = &urange,
- .maxlen = sizeof(urange),
- .mode = table->mode,
- .extra1 = &ip_ping_group_range_min,
- .extra2 = &ip_ping_group_range_max,
- };
- inet_get_ping_group_range_table(table, &low, &high);
- urange[0] = from_kgid_munged(user_ns, low);
- urange[1] = from_kgid_munged(user_ns, high);
- ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
- if (write && ret == 0) {
- low = make_kgid(user_ns, urange[0]);
- high = make_kgid(user_ns, urange[1]);
- if (!gid_valid(low) || !gid_valid(high))
- return -EINVAL;
- if (urange[1] < urange[0] || gid_lt(high, low)) {
- low = make_kgid(&init_user_ns, 1);
- high = make_kgid(&init_user_ns, 0);
- }
- set_ping_group_range(table, low, high);
- }
- return ret;
- }
- static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
- {
- struct net *net;
- int ret;
- net = container_of(table->data, struct net,
- ipv4.sysctl_ip_fwd_update_priority);
- ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
- if (write && ret == 0)
- call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
- net);
- return ret;
- }
- static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
- {
- struct net *net = container_of(ctl->data, struct net,
- ipv4.tcp_congestion_control);
- char val[TCP_CA_NAME_MAX];
- struct ctl_table tbl = {
- .data = val,
- .maxlen = TCP_CA_NAME_MAX,
- };
- int ret;
- tcp_get_default_congestion_control(net, val);
- ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
- if (write && ret == 0)
- ret = tcp_set_default_congestion_control(net, val);
- return ret;
- }
- static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
- int write, void *buffer,
- size_t *lenp, loff_t *ppos)
- {
- struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
- int ret;
- tbl.data = kmalloc(tbl.maxlen, GFP_USER);
- if (!tbl.data)
- return -ENOMEM;
- tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
- ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
- kfree(tbl.data);
- return ret;
- }
- static int proc_allowed_congestion_control(struct ctl_table *ctl,
- int write, void *buffer,
- size_t *lenp, loff_t *ppos)
- {
- struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
- int ret;
- tbl.data = kmalloc(tbl.maxlen, GFP_USER);
- if (!tbl.data)
- return -ENOMEM;
- tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
- ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
- if (write && ret == 0)
- ret = tcp_set_allowed_congestion_control(tbl.data);
- kfree(tbl.data);
- return ret;
- }
- static int sscanf_key(char *buf, __le32 *key)
- {
- u32 user_key[4];
- int i, ret = 0;
- if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
- user_key + 2, user_key + 3) != 4) {
- ret = -EINVAL;
- } else {
- for (i = 0; i < ARRAY_SIZE(user_key); i++)
- key[i] = cpu_to_le32(user_key[i]);
- }
- pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
- user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
- return ret;
- }
- static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
- {
- struct net *net = container_of(table->data, struct net,
- ipv4.sysctl_tcp_fastopen);
- /* maxlen to print the list of keys in hex (*2), with dashes
- * separating doublewords and a comma in between keys.
- */
- struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
- 2 * TCP_FASTOPEN_KEY_MAX) +
- (TCP_FASTOPEN_KEY_MAX * 5)) };
- u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
- __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
- char *backup_data;
- int ret, i = 0, off = 0, n_keys;
- tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
- if (!tbl.data)
- return -ENOMEM;
- n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
- if (!n_keys) {
- memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
- n_keys = 1;
- }
- for (i = 0; i < n_keys * 4; i++)
- user_key[i] = le32_to_cpu(key[i]);
- for (i = 0; i < n_keys; i++) {
- off += snprintf(tbl.data + off, tbl.maxlen - off,
- "%08x-%08x-%08x-%08x",
- user_key[i * 4],
- user_key[i * 4 + 1],
- user_key[i * 4 + 2],
- user_key[i * 4 + 3]);
- if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
- break;
- if (i + 1 < n_keys)
- off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
- }
- ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
- if (write && ret == 0) {
- backup_data = strchr(tbl.data, ',');
- if (backup_data) {
- *backup_data = '\0';
- backup_data++;
- }
- if (sscanf_key(tbl.data, key)) {
- ret = -EINVAL;
- goto bad_key;
- }
- if (backup_data) {
- if (sscanf_key(backup_data, key + 4)) {
- ret = -EINVAL;
- goto bad_key;
- }
- }
- tcp_fastopen_reset_cipher(net, NULL, key,
- backup_data ? key + 4 : NULL);
- }
- bad_key:
- kfree(tbl.data);
- return ret;
- }
- static void proc_configure_early_demux(int enabled, int protocol)
- {
- struct net_protocol *ipprot;
- #if IS_ENABLED(CONFIG_IPV6)
- struct inet6_protocol *ip6prot;
- #endif
- rcu_read_lock();
- ipprot = rcu_dereference(inet_protos[protocol]);
- if (ipprot)
- ipprot->early_demux = enabled ? ipprot->early_demux_handler :
- NULL;
- #if IS_ENABLED(CONFIG_IPV6)
- ip6prot = rcu_dereference(inet6_protos[protocol]);
- if (ip6prot)
- ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
- NULL;
- #endif
- rcu_read_unlock();
- }
- static int proc_tcp_early_demux(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
- {
- int ret = 0;
- ret = proc_dointvec(table, write, buffer, lenp, ppos);
- if (write && !ret) {
- int enabled = init_net.ipv4.sysctl_tcp_early_demux;
- proc_configure_early_demux(enabled, IPPROTO_TCP);
- }
- return ret;
- }
- static int proc_udp_early_demux(struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos)
- {
- int ret = 0;
- ret = proc_dointvec(table, write, buffer, lenp, ppos);
- if (write && !ret) {
- int enabled = init_net.ipv4.sysctl_udp_early_demux;
- proc_configure_early_demux(enabled, IPPROTO_UDP);
- }
- return ret;
- }
- static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
- int write, void *buffer,
- size_t *lenp, loff_t *ppos)
- {
- struct net *net = container_of(table->data, struct net,
- ipv4.sysctl_tcp_fastopen_blackhole_timeout);
- int ret;
- ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
- if (write && ret == 0)
- atomic_set(&net->ipv4.tfo_active_disable_times, 0);
- return ret;
- }
- static int proc_tcp_available_ulp(struct ctl_table *ctl,
- int write, void *buffer, size_t *lenp,
- loff_t *ppos)
- {
- struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
- int ret;
- tbl.data = kmalloc(tbl.maxlen, GFP_USER);
- if (!tbl.data)
- return -ENOMEM;
- tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
- ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
- kfree(tbl.data);
- return ret;
- }
- #ifdef CONFIG_IP_ROUTE_MULTIPATH
- static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
- void *buffer, size_t *lenp,
- loff_t *ppos)
- {
- struct net *net = container_of(table->data, struct net,
- ipv4.sysctl_fib_multipath_hash_policy);
- int ret;
- ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
- if (write && ret == 0)
- call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
- return ret;
- }
- #endif
- static struct ctl_table ipv4_table[] = {
- {
- .procname = "tcp_max_orphans",
- .data = &sysctl_tcp_max_orphans,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "inet_peer_threshold",
- .data = &inet_peer_threshold,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "inet_peer_minttl",
- .data = &inet_peer_minttl,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- {
- .procname = "inet_peer_maxttl",
- .data = &inet_peer_maxttl,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- {
- .procname = "tcp_mem",
- .maxlen = sizeof(sysctl_tcp_mem),
- .data = &sysctl_tcp_mem,
- .mode = 0644,
- .proc_handler = proc_doulongvec_minmax,
- },
- {
- .procname = "tcp_low_latency",
- .data = &sysctl_tcp_low_latency,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- #ifdef CONFIG_NETLABEL
- {
- .procname = "cipso_cache_enable",
- .data = &cipso_v4_cache_enabled,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "cipso_cache_bucket_size",
- .data = &cipso_v4_cache_bucketsize,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "cipso_rbm_optfmt",
- .data = &cipso_v4_rbm_optfmt,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "cipso_rbm_strictvalid",
- .data = &cipso_v4_rbm_strictvalid,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- #endif /* CONFIG_NETLABEL */
- {
- .procname = "tcp_available_ulp",
- .maxlen = TCP_ULP_BUF_MAX,
- .mode = 0444,
- .proc_handler = proc_tcp_available_ulp,
- },
- {
- .procname = "icmp_msgs_per_sec",
- .data = &sysctl_icmp_msgs_per_sec,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- },
- {
- .procname = "icmp_msgs_burst",
- .data = &sysctl_icmp_msgs_burst,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- },
- {
- .procname = "udp_mem",
- .data = &sysctl_udp_mem,
- .maxlen = sizeof(sysctl_udp_mem),
- .mode = 0644,
- .proc_handler = proc_doulongvec_minmax,
- },
- {
- .procname = "fib_sync_mem",
- .data = &sysctl_fib_sync_mem,
- .maxlen = sizeof(sysctl_fib_sync_mem),
- .mode = 0644,
- .proc_handler = proc_douintvec_minmax,
- .extra1 = &sysctl_fib_sync_mem_min,
- .extra2 = &sysctl_fib_sync_mem_max,
- },
- {
- .procname = "tcp_rx_skb_cache",
- .data = &tcp_rx_skb_cache_key.key,
- .mode = 0644,
- .proc_handler = proc_do_static_key,
- },
- {
- .procname = "tcp_tx_skb_cache",
- .data = &tcp_tx_skb_cache_key.key,
- .mode = 0644,
- .proc_handler = proc_do_static_key,
- },
- { }
- };
- static struct ctl_table ipv4_net_table[] = {
- {
- .procname = "icmp_echo_ignore_all",
- .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "icmp_echo_ignore_broadcasts",
- .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "icmp_ignore_bogus_error_responses",
- .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "icmp_errors_use_inbound_ifaddr",
- .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "icmp_ratelimit",
- .data = &init_net.ipv4.sysctl_icmp_ratelimit,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_ms_jiffies,
- },
- {
- .procname = "icmp_ratemask",
- .data = &init_net.ipv4.sysctl_icmp_ratemask,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "ping_group_range",
- .data = &init_net.ipv4.ping_group_range.range,
- .maxlen = sizeof(gid_t)*2,
- .mode = 0644,
- .proc_handler = ipv4_ping_group_range,
- },
- #ifdef CONFIG_NET_L3_MASTER_DEV
- {
- .procname = "raw_l3mdev_accept",
- .data = &init_net.ipv4.sysctl_raw_l3mdev_accept,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- #endif
- {
- .procname = "tcp_ecn",
- .data = &init_net.ipv4.sysctl_tcp_ecn,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_ecn_fallback",
- .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "ip_dynaddr",
- .data = &init_net.ipv4.sysctl_ip_dynaddr,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "ip_early_demux",
- .data = &init_net.ipv4.sysctl_ip_early_demux,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "udp_early_demux",
- .data = &init_net.ipv4.sysctl_udp_early_demux,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_udp_early_demux
- },
- {
- .procname = "tcp_early_demux",
- .data = &init_net.ipv4.sysctl_tcp_early_demux,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_tcp_early_demux
- },
- {
- .procname = "nexthop_compat_mode",
- .data = &init_net.ipv4.sysctl_nexthop_compat_mode,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- {
- .procname = "ip_default_ttl",
- .data = &init_net.ipv4.sysctl_ip_default_ttl,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = &ip_ttl_min,
- .extra2 = &ip_ttl_max,
- },
- {
- .procname = "ip_local_port_range",
- .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
- .data = &init_net.ipv4.ip_local_ports.range,
- .mode = 0644,
- .proc_handler = ipv4_local_port_range,
- },
- {
- .procname = "ip_local_reserved_ports",
- .data = &init_net.ipv4.sysctl_local_reserved_ports,
- .maxlen = 65536,
- .mode = 0644,
- .proc_handler = proc_do_large_bitmap,
- },
- {
- .procname = "ip_local_unbindable_ports",
- .data = &init_net.ipv4.sysctl_local_unbindable_ports,
- .maxlen = 65536,
- .mode = 0644,
- .proc_handler = proc_do_large_bitmap,
- },
- {
- .procname = "ip_no_pmtu_disc",
- .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "ip_forward_use_pmtu",
- .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "ip_forward_update_priority",
- .data = &init_net.ipv4.sysctl_ip_fwd_update_priority,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = ipv4_fwd_update_priority,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- {
- .procname = "ip_nonlocal_bind",
- .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "ip_autobind_reuse",
- .data = &init_net.ipv4.sysctl_ip_autobind_reuse,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- {
- .procname = "fwmark_reflect",
- .data = &init_net.ipv4.sysctl_fwmark_reflect,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "tcp_fwmark_accept",
- .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- #ifdef CONFIG_NET_L3_MASTER_DEV
- {
- .procname = "tcp_l3mdev_accept",
- .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- #endif
- {
- .procname = "tcp_mtu_probing",
- .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "tcp_base_mss",
- .data = &init_net.ipv4.sysctl_tcp_base_mss,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "tcp_min_snd_mss",
- .data = &init_net.ipv4.sysctl_tcp_min_snd_mss,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = &tcp_min_snd_mss_min,
- .extra2 = &tcp_min_snd_mss_max,
- },
- {
- .procname = "tcp_mtu_probe_floor",
- .data = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = &tcp_min_snd_mss_min,
- .extra2 = &tcp_min_snd_mss_max,
- },
- {
- .procname = "tcp_probe_threshold",
- .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "tcp_probe_interval",
- .data = &init_net.ipv4.sysctl_tcp_probe_interval,
- .maxlen = sizeof(u32),
- .mode = 0644,
- .proc_handler = proc_douintvec_minmax,
- .extra2 = &u32_max_div_HZ,
- },
- {
- .procname = "igmp_link_local_mcast_reports",
- .data = &init_net.ipv4.sysctl_igmp_llm_reports,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "igmp_max_memberships",
- .data = &init_net.ipv4.sysctl_igmp_max_memberships,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "igmp_max_msf",
- .data = &init_net.ipv4.sysctl_igmp_max_msf,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- #ifdef CONFIG_IP_MULTICAST
- {
- .procname = "igmp_qrv",
- .data = &init_net.ipv4.sysctl_igmp_qrv,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ONE
- },
- #endif
- {
- .procname = "tcp_congestion_control",
- .data = &init_net.ipv4.tcp_congestion_control,
- .mode = 0644,
- .maxlen = TCP_CA_NAME_MAX,
- .proc_handler = proc_tcp_congestion_control,
- },
- {
- .procname = "tcp_available_congestion_control",
- .maxlen = TCP_CA_BUF_MAX,
- .mode = 0444,
- .proc_handler = proc_tcp_available_congestion_control,
- },
- {
- .procname = "tcp_allowed_congestion_control",
- .maxlen = TCP_CA_BUF_MAX,
- .mode = 0644,
- .proc_handler = proc_allowed_congestion_control,
- },
- {
- .procname = "tcp_keepalive_time",
- .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- {
- .procname = "tcp_keepalive_probes",
- .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_keepalive_intvl",
- .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- {
- .procname = "tcp_syn_retries",
- .data = &init_net.ipv4.sysctl_tcp_syn_retries,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = &tcp_syn_retries_min,
- .extra2 = &tcp_syn_retries_max
- },
- {
- .procname = "tcp_synack_retries",
- .data = &init_net.ipv4.sysctl_tcp_synack_retries,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- #ifdef CONFIG_SYN_COOKIES
- {
- .procname = "tcp_syncookies",
- .data = &init_net.ipv4.sysctl_tcp_syncookies,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- #endif
- {
- .procname = "tcp_reordering",
- .data = &init_net.ipv4.sysctl_tcp_reordering,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_retries1",
- .data = &init_net.ipv4.sysctl_tcp_retries1,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra2 = &tcp_retr1_max
- },
- {
- .procname = "tcp_retries2",
- .data = &init_net.ipv4.sysctl_tcp_retries2,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_orphan_retries",
- .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_fin_timeout",
- .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- {
- .procname = "tcp_notsent_lowat",
- .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_douintvec,
- },
- {
- .procname = "tcp_tw_reuse",
- .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = &two,
- },
- {
- .procname = "tcp_max_tw_buckets",
- .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_max_syn_backlog",
- .data = &init_net.ipv4.sysctl_max_syn_backlog,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_fastopen",
- .data = &init_net.ipv4.sysctl_tcp_fastopen,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "tcp_fastopen_key",
- .mode = 0600,
- .data = &init_net.ipv4.sysctl_tcp_fastopen,
- /* maxlen to print the list of keys in hex (*2), with dashes
- * separating doublewords and a comma in between keys.
- */
- .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
- 2 * TCP_FASTOPEN_KEY_MAX) +
- (TCP_FASTOPEN_KEY_MAX * 5)),
- .proc_handler = proc_tcp_fastopen_key,
- },
- {
- .procname = "tcp_fastopen_blackhole_timeout_sec",
- .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_tfo_blackhole_detect_timeout,
- .extra1 = SYSCTL_ZERO,
- },
- #ifdef CONFIG_IP_ROUTE_MULTIPATH
- {
- .procname = "fib_multipath_use_neigh",
- .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- {
- .procname = "fib_multipath_hash_policy",
- .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_fib_multipath_hash_policy,
- .extra1 = SYSCTL_ZERO,
- .extra2 = &two,
- },
- #endif
- {
- .procname = "ip_unprivileged_port_start",
- .maxlen = sizeof(int),
- .data = &init_net.ipv4.sysctl_ip_prot_sock,
- .mode = 0644,
- .proc_handler = ipv4_privileged_ports,
- },
- #ifdef CONFIG_NET_L3_MASTER_DEV
- {
- .procname = "udp_l3mdev_accept",
- .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- #endif
- {
- .procname = "tcp_sack",
- .data = &init_net.ipv4.sysctl_tcp_sack,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_window_scaling",
- .data = &init_net.ipv4.sysctl_tcp_window_scaling,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_timestamps",
- .data = &init_net.ipv4.sysctl_tcp_timestamps,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_early_retrans",
- .data = &init_net.ipv4.sysctl_tcp_early_retrans,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = &four,
- },
- {
- .procname = "tcp_recovery",
- .data = &init_net.ipv4.sysctl_tcp_recovery,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "tcp_thin_linear_timeouts",
- .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_slow_start_after_idle",
- .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_retrans_collapse",
- .data = &init_net.ipv4.sysctl_tcp_retrans_collapse,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_stdurg",
- .data = &init_net.ipv4.sysctl_tcp_stdurg,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_rfc1337",
- .data = &init_net.ipv4.sysctl_tcp_rfc1337,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_abort_on_overflow",
- .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_fack",
- .data = &init_net.ipv4.sysctl_tcp_fack,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_max_reordering",
- .data = &init_net.ipv4.sysctl_tcp_max_reordering,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_dsack",
- .data = &init_net.ipv4.sysctl_tcp_dsack,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_app_win",
- .data = &init_net.ipv4.sysctl_tcp_app_win,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_adv_win_scale",
- .data = &init_net.ipv4.sysctl_tcp_adv_win_scale,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = &tcp_adv_win_scale_min,
- .extra2 = &tcp_adv_win_scale_max,
- },
- {
- .procname = "tcp_frto",
- .data = &init_net.ipv4.sysctl_tcp_frto,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_no_metrics_save",
- .data = &init_net.ipv4.sysctl_tcp_nometrics_save,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "tcp_no_ssthresh_metrics_save",
- .data = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- {
- .procname = "tcp_moderate_rcvbuf",
- .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "tcp_tso_win_divisor",
- .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "tcp_workaround_signed_windows",
- .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_limit_output_bytes",
- .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_challenge_ack_limit",
- .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
- .procname = "tcp_min_tso_segs",
- .data = &init_net.ipv4.sysctl_tcp_min_tso_segs,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ONE,
- .extra2 = &gso_max_segs,
- },
- {
- .procname = "tcp_min_rtt_wlen",
- .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = &one_day_secs
- },
- {
- .procname = "tcp_autocorking",
- .data = &init_net.ipv4.sysctl_tcp_autocorking,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- {
- .procname = "tcp_invalid_ratelimit",
- .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_ms_jiffies,
- },
- {
- .procname = "tcp_pacing_ss_ratio",
- .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = &thousand,
- },
- {
- .procname = "tcp_pacing_ca_ratio",
- .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = &thousand,
- },
- {
- .procname = "tcp_wmem",
- .data = &init_net.ipv4.sysctl_tcp_wmem,
- .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ONE,
- },
- {
- .procname = "tcp_rmem",
- .data = &init_net.ipv4.sysctl_tcp_rmem,
- .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ONE,
- },
- {
- .procname = "tcp_comp_sack_delay_ns",
- .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
- .maxlen = sizeof(unsigned long),
- .mode = 0644,
- .proc_handler = proc_doulongvec_minmax,
- },
- {
- .procname = "tcp_comp_sack_slack_ns",
- .data = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
- .maxlen = sizeof(unsigned long),
- .mode = 0644,
- .proc_handler = proc_doulongvec_minmax,
- },
- {
- .procname = "tcp_comp_sack_nr",
- .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = &comp_sack_nr_max,
- },
- {
- .procname = "tcp_reflect_tos",
- .data = &init_net.ipv4.sysctl_tcp_reflect_tos,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ZERO,
- .extra2 = SYSCTL_ONE,
- },
- {
- .procname = "udp_rmem_min",
- .data = &init_net.ipv4.sysctl_udp_rmem_min,
- .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ONE
- },
- {
- .procname = "udp_wmem_min",
- .data = &init_net.ipv4.sysctl_udp_wmem_min,
- .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ONE
- },
- { }
- };
- static __net_init int ipv4_sysctl_init_net(struct net *net)
- {
- struct ctl_table *table;
- table = ipv4_net_table;
- if (!net_eq(net, &init_net)) {
- int i;
- table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
- if (!table)
- goto err_alloc;
- for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
- if (table[i].data) {
- /* Update the variables to point into
- * the current struct net
- */
- table[i].data += (void *)net - (void *)&init_net;
- } else {
- /* Entries without data pointer are global;
- * Make them read-only in non-init_net ns
- */
- table[i].mode &= ~0222;
- }
- }
- }
- net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
- if (!net->ipv4.ipv4_hdr)
- goto err_reg;
- net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
- if (!net->ipv4.sysctl_local_reserved_ports)
- goto err_reserved_ports;
- net->ipv4.sysctl_local_unbindable_ports = kzalloc(65536 / 8, GFP_KERNEL);
- if (!net->ipv4.sysctl_local_unbindable_ports)
- goto err_unbindable_ports;
- return 0;
- err_unbindable_ports:
- kfree(net->ipv4.sysctl_local_reserved_ports);
- err_reserved_ports:
- unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
- err_reg:
- if (!net_eq(net, &init_net))
- kfree(table);
- err_alloc:
- return -ENOMEM;
- }
- static __net_exit void ipv4_sysctl_exit_net(struct net *net)
- {
- struct ctl_table *table;
- kfree(net->ipv4.sysctl_local_unbindable_ports);
- kfree(net->ipv4.sysctl_local_reserved_ports);
- table = net->ipv4.ipv4_hdr->ctl_table_arg;
- unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
- kfree(table);
- }
- static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
- .init = ipv4_sysctl_init_net,
- .exit = ipv4_sysctl_exit_net,
- };
- static __init int sysctl_ipv4_init(void)
- {
- struct ctl_table_header *hdr;
- hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
- if (!hdr)
- return -ENOMEM;
- if (register_pernet_subsys(&ipv4_sysctl_ops)) {
- unregister_net_sysctl_table(hdr);
- return -ENOMEM;
- }
- return 0;
- }
- __initcall(sysctl_ipv4_init);
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